Forgive me. My daughter has beautiful long blonde hair that was constantly 'brushed' thru elementary school friends and our battles with those bugs 'bout drove me nuts. Really.
I'd love to know what really works.
Then I homeschooled. A lot fewer health problems as a result. Their brains were protected, too.
Lime, as in agricultural lime...white powder...mix to a gooey paste with water and apply, as with toothpaste. Leave in to make a fashion statement. If kids are into piercing their faces, no problem being a cement-head: your kids can be way ahead of the curve on this.